<!doctype html>
<html lang="en" xmlns:v-bind="http://www.w3.org/1999/xhtml" xmlns:v-on="http://www.w3.org/1999/xhtml" xmlns:v-model="http://www.w3.org/1999/xhtml">
<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <style>
        .active {
            color:green;
        }
        .error {
            color:red;
        }
        .bold {
            font-weight: bold;
        }
    </style>
</head>
<body>

<div id="app">
    <div :class="[{active:isActive},'bold']">样式</div>

</div>
</body>
<script src="../../vender/vue@2.4.2.js"></script>
<script>

    var app=new Vue({
        el:'#app',
        data:{
            isActive:true
        }
    });

</script>
</html>